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-   -   Adding four inches of foam board . (http://www.diychatroom.com/f103/adding-four-inches-foam-board-197895/)

Gerry Hendry 03-16-2014 06:16 PM

Adding four inches of foam board .
 
Ow do I attach 4 inches of foam board insulation to the inside of a cathedral ceiling?

sixeightten 03-16-2014 06:56 PM

long screws with a fender washer

Windows on Wash 03-17-2014 12:08 AM

Foam washers work well too.

https://www.warehousebay.com/catalog...f3f647ed90cfce

Gerry Hendry 03-18-2014 02:40 PM

Thanks.Would Roxall at 2ft centres and 2xframing be cheaper and more fire resistent?

iminaquagmire 03-18-2014 03:25 PM

What exactly are you trying to do? Fill in rafter bays with insulation? Assuming the venting is ok in the cathedral roof section and the you're ready to insulate, yes Roxul would certainly be more fire resistant, but depending on code where you are, would be harder to get to the proper R value.

Gerry Hendry 03-18-2014 03:53 PM

I'madding insulation to an existing cathedral ceiling leaving the drywall intact.


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